main {
    width: 1200px;
    margin: 0 auto;
    margin-top: 70px;
    border: solid 2px #eee;
    box-shadow: rgba(0, 0, 0, 0.1) 0 0 10px;
    box-sizing: content-box;
    div.title {
        height: 100px;
        border-bottom: solid 2px #eee;
        div.text1{
            padding: 20px;
            font-size: 20px;
            color: #aaa;
        }
        div.text2 {
            padding: 0 0 10px 20px;
            color: #abb;
        }
    }
    div.course {
        padding: 20px;
        height: 90vh;
        &>div {
            float: left;
            margin: 10px;
            width:360px;
            border: solid 1px #eee;
        }
        .decoration {
            text-align: center;
            font-size: 17px;
            color: #aaa;
        }
    }
    
}
